| 发明名称 |
Sheet inspection method and apparatus. |
| 摘要 |
<p>A method of inspecting a sheet (4) with radiation to which the sheet is substantially opaque comprising irradiating the sheet with the radiation; retroreflecting any radiation which has passed through the sheet; and detecting the retroreflected radiation after it has passed through the sheet.</p> |
| 申请公布号 |
EP0408337(A1) |
申请公布日期 |
1991.01.16 |
| 申请号 |
EP19900307582 |
申请日期 |
1990.07.11 |
| 申请人 |
DE LA RUE SYSTEMS LIMITED |
发明人 |
BURGE, ANTHONY ROBERT;POTTER, MICHAEL |
| 分类号 |
G01N21/89;G01N21/892;G07D7/00;G07D7/12;G07D7/16 |
主分类号 |
G01N21/89 |
| 代理机构 |
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代理人 |
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| 地址 |
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